My experiance tells me that they are.
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one of my nearby lakes starts out relatively narrow, steep-walled and 25-40ft deep. then it widens out to the main portion with several feeder arms. it has decent crappie but the only gills i've caught are in the 6" range. i'm really hoping to find some deep beds on the si too.
Russ Bailey has a good video on his Midwest Crappie site. Richard Williams shows how you can find them and what it looks like when fish are on them. I was surprised to see how far off the bank most of these bluegill beds were.
Very cool images! I need to start saving so I can get a SI unit.
Off the oxbows and coves in the St. Johns River in FL, I used to get into bigger shellcracker and bull bluegill at different times of year. Most related to structure that broke the current but when beds were found we would troll over them and have exceptional days. I've gotten big bulls that I couldn't get my hand around in 2' of water, reliably. I think it's just their comfort zone. The 'crackers off lake Dexter were in 5 fow or more though. Anytime you went. Had a metal boat and you could hear the snailshells hit the boat that were floating after becoming dinner, great fun.
Will say with Side Scan, you see it ALL...